There were two typos on the checklist, "Goonman's" was spelled "Goodman's" and "Spill's Bros." was written as "Spills Bad". This was fixed somewhere in the middle of the run, leading to two versions of the checklist. Neither version is considered rarer than the other.

Two titles were pulled during production, Run-a-way Vitamins and Truant Cigarettes. But they were pulled rather late in production so are not particularly rare. It only became clear that they had been pulled when an uncut sheet without them showed up (compare to the sheet with them).

In the 6th series we see the expanded use an artist who is clearly not Norm Saunders.